Hartford-area Congressman John Larson wants to stabilize the Social Security Trust Fund, by having high-income people contribute more to the program, and by gradually increasing the amount of money workers and employers contribute.

Republicans stepped up pressure Monday on Democratic Gov. Dannel P. Malloy and the General Assembly’s majority Democrats to stop a looming increase in the state’s gasoline and diesel taxes, launching a petition drive at gas stations across Connecticut and on the Internet.

The legislature’s tax-writing committee has approved a revenue package that delays the governor’s proposal to slash car taxes, extends a surcharge on Connecticut’s corporation tax and creates a tax amnesty program.